Improve local seed data with dedicated teacher and student login

* This will also reduce the total number of internal users created through the seeds.

db/seeds/development.rb

@@ -5,16 +5,19 @@ FactoryBot.create(:consumer, name: 'openSAP')
 # users
 # Set default_url_options explicitly, required for rake task
 Rails.application.routes.default_url_options = Rails.application.config.action_mailer.default_url_options
-[:admin, :external_user, :teacher].each { |factory_name| FactoryBot.create(factory_name) }
+admin = FactoryBot.create(:admin)
+teacher = FactoryBot.create(:teacher, email: 'teacher@example.org')
+FactoryBot.create(:learner, email: 'learner@example.org')
+external_user = FactoryBot.create(:external_user)
 
 # execution environments
-ExecutionEnvironment.create_factories
+ExecutionEnvironment.create_factories user: admin
 
 # exercises
-@exercises = find_factories_by_class(Exercise).map(&:name).map { |factory_name| [factory_name, FactoryBot.create(factory_name)] }.to_h
+@exercises = find_factories_by_class(Exercise).map(&:name).map { |factory_name| [factory_name, FactoryBot.create(factory_name, user: teacher)] }.to_h
 
 # file types
 FileType.create_factories
 
 # submissions
-FactoryBot.create(:submission, exercise: @exercises[:fibonacci])
+FactoryBot.create(:submission, exercise: @exercises[:fibonacci], user: external_user)

docs/LOCAL_SETUP.md

@@ -42,10 +42,21 @@ cd /home/vagrant/codeocean
 rails s -p 3000 -b 0.0.0.0
 ```
 
-The default credentials for the administrator are:
+The default credentials for the internal users are the following: 
 
-- email: `admin@example.org`
+- Administrator:  
-- password: `admin`
+  email: `admin@example.org`  
+  password: `admin`
+- Teacher:  
+  email: `teacher@example.org`  
+  password: `teacher`
+- Learner:  
+  email: `learner@example.org`  
+  password: `learner`
+  
+Additional internal users can be created using the web interface. In development, the activation mail is printed to the console. Use the activation link found in that mail to set a password for a new user.
+
+#### Metrics
 
 For exporting metrics, start the prometeus exporter by running